Cryogenic readout electronics for astronomical applications

Details Cryogenic readout electronics for astronomical applications Cryogenic readout electronics for astronomical applications

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.356..405d&link_type=abstract

In ESA, Proceedings of an ESA Symposium on Photon Detectors for Space Instrumentation p 405-408 (SEE N94-15025 03-19)

Astronomy and Astrophysics

Astronomy

1

Cryogenic Equipment, Electronics, Focal Plane Devices, Infrared Astronomy, Infrared Detectors, Readout, Cmos, Design Analysis, Feedback Amplifiers, Infrared Space Observatory (Iso), Multiplexing, Photoconductivity, Satellite-Borne Instruments, Signal To Noise Ratios, Spaceborne Astronomy, Temperature Effects

Scientific paper

The development of the cold readout electronics for the ISOPHOT focal plane experiment on the ISO (Infrared Space Observatory) is reported. For this low background application, custom designed highly sensitive integrating charge amplifiers are used for the readout of the extrinsic IR detectors. The use of CMOS circuits allows the multiplexing and readout of a large number of detectors at the detector temperature, with a very low power dissipation. The CMOS readout amplifier/multiplexer for deep cryogenic operation is discussed. The device is able to interface directly with extrinsic photoconductive detectors cooled down to the 1.8 to 10K range. In order to observe faint objects under low light level conditions the integration capacitor is 80 fF, featuring a saturation at 1 million charge carriers for an output voltage swing of 2 V and a noise level of 0.5 mV root mean square in nondestructive readout mode. With this circuit coupled to detectors with a responsivity of around 5 to 10 A/W, it is possible to reach noise equivalent power values of 10 to the minus 17th power W/square root of Hz. The multiplexer can be operated with only 10 wires for the supplies, and the clocking of the circuits.

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